Chapter 6 _______________________________________________________________ Maintenance
VAISALA _______________________________________________________________________ 175
FSM102 Calibration Procedure
The calibration procedure is performed as follows:
1. Follow the steps in section FSM102 Calibration Check Procedure
on page 173 (if not yet done).
2. Install the calibrator assembly on the measurement unit (if not yet
done).
3. Stay away from the unit to avoid stray scattering into the receiver,
and give the command
CALIBRATE VISIBILITY calibrator_value
For example:
CALIBRATE VISIBILITY 0.790
NOTE
Check the correct calibrator v
alue from the opaque glass plates.
The calibrator value is printed on the labels of the glass plates.
When command execution has finished, FS11P responds DONE
and calculates a new scaling factor and stores it in the non-volatile
FLASH memory.
4. Leave the opaque glass plates in place and continue with section
FSM102 Mechanical Alignment Check Procedure below to
discover if the calibration check failed due to a mechanical
misalignment.
FSM102 Mechanical Alignment Check Procedure
The mechanical alignment check procedure is performed as follows:
1. Perform the calibration check as instructed in section FSM102
Calibration Check Procedure on page 173 (if not yet done).
2. Install the mask plates onto the calibrator plates by opening the
thumbscrews holding the glass plates and sliding the mask plates
under the thumbscrews as shown in Figure 49 on page 176. Secure
the mask plates in place by tightening the thumbscrews.
NOTE
The mask plates are marked "RX" and "TX" and they should face the
receiver and transmitter, accordingly.
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